officials tell abc news, the fbi was investigates petraeus' biographer, paula broadwell, for strange activity on the internet and then some e-mails were discovered in the course of that investigation that raised concern. diane? >> martha raddatz reporting in. and now we go to abc's white house correspondent jake tapper here to tell us what the white house is saying tonight. jake? >> reporter: well, diane, senior white house officials tell us the overwhelming emotion here is surprise and, of course, sorrow, for a colleague and his family. white house officials were told about this on wednesday, the day after president obama was re-elected. they were told by the director of national intelligence, james clapper. on thursday, president obama was informed about this situation. the entire situation, the fbi investigation, as well as the affair. general petraeus called the national security adviser, said he wanted to talk to the president. at that meeting yesterday, he offered to resign. president obama thought about it and today called petraeus and accepted that resignation. the new acting